Ancient Greek philosophers like Parmenides, Zeno and Plato stumbled upon a radical discovery: the distinction between appearance and reality. If we are to ask the question of what reality is (and how we can know this), our best bet at finding some sort of answer would require that we delve deeply into science, mathematics and philosophy.The following documentary explores some of the questions that are currently at the border between scientific inquiry and philosophical speculation: What are the basic constituents of the universe? How does quantum mechanics make sense? What's up with the double-slit experiment? Is mathematics the language in which the laws of the physical universe are written, or is the universe actually part of a mathematical structure? Do we live in a multi-dimensional universe, or are we simply the holographic projection of information forever trapped in the event horizon of some supermassive black hole? And why can't a guy get a date on a Saturday night? :)
I think the pony tail might help explain the mystery of the last question :)

But here's where John Stuart Mill comes in: he developed, classified and formalized a set of methods for testing causal hypotheses (thereby going beyond mere generalizations from few to many or from past to future). As in all cases of induction, though we may never be able to develop a proof based on logical necessity (the way mathematicians and logicians are used to), science can nevertheless make progress by testing hypotheses: any hypothesis that survives the day gets to make it to the next round. Those that are eliminated are discarded and no more neural energy is wasted on them (ideally).